I will buy a new mouse, but idk wich one should I buy.
I have a lot doubts.
So, what is better, laser or optical sensor? why?
And, wich mouse should a choose (I'm looking for a mouse between 40-55€)
kana, kinzu v2, kinzu v2 pro, sensei raw, deathadder?
I have a QcK+ Black, I play with low sensitivity, and I have a medium size hand...

laser its better than optical... it helps too in coloured mousepads but u dont have one so i think for 55€ you should buy some zowie AM or zowie ec1 or ec2...
imo kinzu is too small, kana has horrible buttons, dislike deathadder design,, sensei is OK..
in my opinion u should choose between sensei and zowie...

Depends on a lot of things, but if you mainly play fps games i would buy an optical mouse..
Great mices imo : DeathAdder 3.5G, Kinzu v1, G400 (Didnt liked the shape of it though).. but if you rlly want a laser mouse i would get xai

Hi!
I saw some of your answers to people's opinions and i think you like Kana, I have bought the Kana and it's very good but my problem with it is that sometimes when i'm playing it just turns off and goes back on quickly, and makes me die sometimes :( . Although that problem is not happening anymore and I'm happy :) . Just don't buy Razer.

Any mouse based on Avago 9500 (currently the best laser sensor) sensor will be a great choice. Examples are SpeedLink Kudos, Omega Varr V6000, Prestigio PMSG1, Revoltec Fightmouse Elite, Gigabyte M8000x, Logitech G500, Steelseries Xai, Corsair M60, Corsair M90, Steelseries Sensei (avoid RAW version). Most of the Razer or Steelseries stuff sux in terms of precision. It's only due to huuuuuuge marketing and sponsoring purposes, that's why they are so popular. Not to mention you are overpaying in most of this cases.

3500 DPI Deathadder sux, unless you are able to get the old, 1800 DPI version. And i wouldn't suggest the 2013 version neither. Razer mice have poor sensor which is strongly boosted by software/drivers.

Zowie is the way to go if you want something new. But, intelli 3.0 works superbly on a qck+
Deathadder is a very good mouse though, although quite a high lift off distance :/ Zowie similar but with the lowest liftoff distance on the market.
Deathadder and EC1 are the exact same shape and size. EC2 is smaller but same shape. Zowie AM is ambidextrous, pretty much the same engine though. I believe there's a new NB (neo) one now...